The only thing that comes to my mind when this happens is to remove your focus from gambling and focus in something else, whatever it is , just be different from gambling.
It works for me and if you don't change your focus there is no other way to change your mood, you will be sad and down.
Yes, because if we focus on gambling for sure next to it is addiction and will lead us to non stop playing of it if we don't know how to manage ourselves through that. It is really hard if we are already attached in one thing.